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Oxidative dehydrogenation of ethane with carbon dioxide over silica molecular sieves supported chromium oxides:pore size effect

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Chinese Journal of Chemical Engineering 2021年第6期34卷 77-86页

作者： Zhibin Deng Xing Ge Wenting Zhang Shizhong Luo Jun Shen Fangli Jing Wei Chu College of Civil Aviation Safety Engineering Civil Aviation Flight University of ChinaGuanghan 618307China Sinopec Petroleum Exploration and Production Research Institute Northwest Oilfield BranchUrumqi 830011China School of Chemical Engineering Sichuan UniversityChengdu 610065China

SBA-15 with varied pore size from 4 to 8 nm were synthesized by tuning the temperature of hydrothermal treatment,the supports were then used to load the active phase Cr Oxthrough a conventional impregnation *** resulting catalysts were characterized by small/wide angle XRD,N_(2) adsorption/desorption,FT-IR,TEM-EDX,XPS,TPR and CO_(2)-TPD to study the feature of structure,surface chemical state,redox and *** was found from these results that the metal species could be well dispersed on catalysts with larger pore ***^(6+)species could enter into the framework by substituting the Si atoms of SBA-15,and Cr^(3+)mainly exist on extra *** size had profound effects on reducibility,surface composition and ***^(6+)species were necessary to activate the C-H bonds of alkanes,while the basicity played an important role in activating C-O bonds of CO_(2).The best performances were achieved over the sample Cr supported on SBA-15 with a pore diameter of 7 nm in oxidative dehydrogenation of ethane in the presence of CO_(2).

关键词： Ethylene SBA-15 pore size effect Cr catalysts Heterogeneous catalysis

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pore size effects of nanoporous carbons with ultra-high surface area on high-pressure hydrogen storage

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Journal of Energy Chemistry 2015年第1期24卷 1-8页

作者： Zhen Geng Cunman Zhang Dabin Wang Xiangyang Zhou Mei Cai Clean Energy Automotive Engineering Center Tongji University School of Materials Science and Technology Tongji University School of Automotive Studies Tongji University Research & Development Center General Motors

In this work, the morphologies and pore structures of a series of corncob-derived activated carbons and zeolite templated carbon with ultrahigh surface area were carefully investigated by SEM, HRTEM and N2-sorption characterization technologies. The high-pressure hydrogen uptake performance was analyzed using standard Pressure-Composition-Temperature apparatus in order to study the pore size effects on hydrogen uptake. These as-obtained porous carbons showed different characteristics of pore size distribution as well as specific surface area. The results indicate that the most effective pores for adsorbing hydrogen depended on the storage pressure. These ultramicropores （0.65-0.85 nm） could be the most effective pores on excess H2 uptake at 1 bar, however, micropores （0.85-2 nm） would play a more important role in excess H2 uptake at higher pressure at 77 K. At room temperature, pore size effects on H2 uptake capacity were very weak. Both specific surface area and total pore volume play more important roles than pore size for H2 uptake at room temperature, which was clearly different from that at 77 K. For applications in future, the corncob-derived activated carbons can be more available than zeolite templated carbons at 77 K. Element doping enhanced hydrogen uptake could be main research direction for improving H2 uptake capacity at room temperature.

关键词： corncob activated carbon zeolite templated carbon hydrogen storage pore size effect

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